H01Q1/22—Supports; Mounting means by structural association with other equipment or articles

H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set

H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM

H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use

H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas

H—ELECTRICITY

H01—BASIC ELECTRIC ELEMENTS

H01Q—ANTENNAS, i.e. RADIO AERIALS

H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements

H01Q5/30—Arrangements for providing operation on different wavebands

H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way

H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors

H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching

H—ELECTRICITY

H01—BASIC ELECTRIC ELEMENTS

H01Q—ANTENNAS, i.e. RADIO AERIALS

H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements

H01Q5/30—Arrangements for providing operation on different wavebands

H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way

H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes

H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point

H01Q5/364—Creating multiple current paths

H01Q5/371—Branching current paths

H—ELECTRICITY

H01—BASIC ELECTRIC ELEMENTS

H01Q—ANTENNAS, i.e. RADIO AERIALS

H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements

H01Q5/30—Arrangements for providing operation on different wavebands

H01Q5/378—Combination of fed elements with parasitic elements

H—ELECTRICITY

H01—BASIC ELECTRIC ELEMENTS

H01Q—ANTENNAS, i.e. RADIO AERIALS

H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements

Solche Antennen werden beispielsweise in Mobiltelefonen für Kommunikationsverbindungen mit zugehörigen Basisstationen eines Mobilfunknetzes verwendet. Such antennas are used for example in mobile telephones for communication connections with associated base stations of a mobile radio network.Sie sind entweder als Monoband-Antenne, zunehmend jedoch als Multiband-Antenne ausgebildet, um der Tatsache Rechnung zu tragen, dass in verschiedenen Regionen der Welt jeweilige Mobilfunkdienste verschiedene Funkfrequenz-Bereiche nutzen. They are either as a single band antenna, but are formed increasingly multi-band antenna to account for the fact that respective mobile services use different radio frequency fields in different regions of the world.Eine solche Multiband-Antenne, nämlich eine Triband-Antenne, ist beispielsweise aus der WO 02/43182 A bekannt. Such a multi-band antenna, namely a tri-band antenna is known, for example from WO 02/43182 A.

Eine elektrische Verbindung zwischen der Induktivität und dem Hochfrequenz-Zuführungspunkt ist derart ausgebildet, dass die Induktivität von der PIFA-Antenne abkoppelbar ist. An electrical connection between the inductance and the high frequency feed point is formed such that the inductance of the PIFA antenna is uncoupled.Auf diese Weise lässt sich ein einfaches Umschalten zwischen zwei Mobilfunk-Standardfrequenzbereichen erreichen. In this way, a simple switching between two mobile radio standard frequency ranges can be achieved.

Es ist hervorzuheben, dass eine Zuschaltung der Induktivität L_p so gewählt werden kann, dass Auswirkungen auf die Resonanzfrequenzeigenschaften des kurzen Arms der Antennefläche P1 und der Antennenfläche P2 nur in zu vernachlässigendem Maße zu erwarten sind. It should be noted that a connection of the inductance L_p can be selected so that effects on the resonance frequency characteristics of the short arm of the antenna surface P1 and P2 of the antenna area are to be expected only in negligible degree.Aufgrund dessen kann durch Zuschaltung der Induktivität L_p die in Figur 3 dargestellte Triband-PIFA-Antenne einfach durch Zuschalten oder Fortlassen der Induktivität L_p hinsichtlich ihres niedrigsten Mobilfunk-Standardfrequenzbereiches verändert werden. Because of this, shown in Figure 3 tri-band PIFA-antenna can be changed by switching on or omitting the inductance L_p respect to their lowest mobile radio standard frequency range by connecting the inductance L_p simple.

Claims (2)

PIFA antenna for a mobile communication terminal having an earth point (G1; G2) and a radio-frequency supply point (S1) and an antenna surface (P1), which has a short arm and a long arm, and is designed both to support a mobile radio standard frequency range at 850 MHz and to support a mobile radio standard frequency range at 900 MHz,characterized in that
an inductance (L_p) is connected between the radio-frequency supply point (S1) and the earth point (G1; G2) in order to vary the resonant frequency of the PIFA antenna, and is of such a magnitude that the lowest resonant frequency of the PIFA antenna with the inductance (L_p) is essentially at 850 MHz, and without the inductance (L_p) is essentially at 900 MHz, and an electrical connection is formed between the inductance (L_p) and the radio-frequency supply point (S1) in such a way that the inductance (L_p) can be decoupled from the PIFA antenna.

PIFA antenna according to Claim 1,characterized in that
the value of the inductance (L_p) is in the range from 8 to 35 nH.